how did they again lonesome roads der but the others?
I don't think this is the matter for this section but:
Joshua Graham was mentioned several times in the main NV game (Honest Hearts)
The Big MT was mentioned by Elijah (Old World Blues)
Elijah himself and his travel to Sierra Madre were mentioned in the BOS quests (Dead Money)
Finally, there were Ulysses clues all over the other DLCs and the main game (Lonesome Road)
I suspect they're doing a similar pattern with Skyrim. I'm sure theres something in Dawnguard that subtlely foreshadowed Dragonborn, same with this machine and the next DLC.Yet, I might be wrong and it may be a general "ancient civlizations" DLC, featuring Snow Elf, Dwemer and ancient Nord mysteries.
EDIT: Also, the crashed skyship... it may just be a nostalgia bonus from bloodmoon... but I think that 2 "mysterious" Dwemer machines in the same DLC is too strange. Even though, the Aetherium Forge was in Dawnguard and it didn't foreshadow anything.